In the future, I would also like to use the RFNoC 2018-06-13 17:42 GMT+03:00 Ivan Zahartchuk <adray0...@gmail.com>:
> I need to rebuild the frequency, do fft and then transfer the whole array > from 70 to 6GHz to the host machine. I do not quite imagine how you can > do this with standard blocks in gnuradio. > > > 2018-06-13 17:32 GMT+03:00 Müller, Marcus (CEL) <muel...@kit.edu>: > >> Dear Ivan, >> >> you don't pass data to a block yourself. >> >> You write a block that does a clearly-limited signal processing job, >> and use GNU Radio to connect that to other blocks: >> >> https://tutorials.gnuradio.org >> >> In your case, instantiating a USRP source in your block makes >> absolutely no sense, for example. You'd build a flow graph containing >> the USRP source, and your custom-written block, and you'd connect these >> two. >> >> It's sadly not really clear what you want to achieve, so I'm afraid I'm >> not able to help you here. >> >> Generally, GNU Radio pretty much takes the idea of "draw a block >> diagram of what you want to achieve with your signal processing", and >> directly translates it to "using existing blocks and writing new ones, >> and letting GNU Radio take care of how the data gets around". >> >> Also, wideband signal processing and implementing a sync_block in >> Python... do not work well together. >> >> So, I think you might really be a bit confused about the architecture >> of GNU Radio – I really hope the tutorials explain that better than I >> could. >> >> Best regards, >> Marcus >> >> On Wed, 2018-06-13 at 17:16 +0300, Ivan Zahartchuk wrote: >> > Hello. I'm trying to write a block in gnuradio for broadband reception. >> > The main problem at the moment is to transfer data to the fft block. >> > I'm new to python and so it's hard for me to figure this out.import >> numpy as np >> > >> > I need an array of data to pass to the gnuradio.fft.fft.vcc block >> > >> > from gnuradio import gr >> > from gnuradio import uhd >> > from gnuradio import fft >> > >> > class blk(gr.sync_block): # other base classes are basic_block, >> decim_block, interp_block >> > """Embedded Python Block example - a simple multiply const""" >> > >> > def __init__(self, >> > gain=1.0,start_freq=70e6,stop_freq=6000e6,samp_rate=30e6): >> # only default arguments here >> > """arguments to this function show up as parameters in GRC""" >> > gr.sync_block.__init__( >> > self, >> > name='Python Block', # will show up in GRC >> > in_sig=None, >> > out_sig=[np.complex64,np.complex64] >> > ) >> > # if an attribute with the same name as a parameter is found, >> > # a callback is registered (properties work, too). >> > self.gain = gain >> > self.start_freq=start_freq >> > self.stop_freq=stop_freq >> > self.samp_rate=samp_rate >> > self.uhd_usrp_source_0 = uhd.usrp_source(",".join(("", "")), >> > uhd.stream_args( >> > cpu_format="fc32", >> > otw_format="sc16", >> > chanels=range(1), >> > ), >> > ) >> > >> > >> > self.uhd_usrp_source_0.set_clock_rate(30e6, uhd.ALL_MBOARDS) >> > self.uhd_usrp_source_0.set_samp_rate(self.samp_rate) >> > self.uhd_usrp_source_0.set_gain(self.gain, 0) >> > self.uhd_usrp_source_0.set_antenna("RX2", 0) >> > self.uhd_usrp_source_0.set_bandwidth(30e6, 0) >> > self.range_freq=(self.stop_freq-self.start_freq)/self.samp_rate >> > >> > def work(self, input_items, output_items): >> > """example: multiply with constant""" >> > for i in np.range(self.range_freq): >> > self.uhd_usrp_source_0.set_center_freq(self.start_freq+self >> .samp_rate*i) >> > data=np.array(self.uhd_usrp_source_0.finite_acquisition(819 >> 2)) >> > output_items[0][:] = input_items[0] * self.example_param >> > return len(output_items[0]) >> > _______________________________________________ >> > Discuss-gnuradio mailing list >> > Discuss-gnuradio@gnu.org >> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > >
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